Update to string-cache 0.3

components/gfx/platform/dummy/font_template.rs

@@ -2,8 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use servo_atoms::Atom;
 use std::io::Error;
-use string_cache::Atom;
 use webrender_traits::NativeFontHandle;
 
 #[derive(Deserialize, Serialize, Debug)]